A simple Atwood’s machine uses a massless
pulley and two masses m1 and m2. Starting
from rest, the speed of the two masses is
6.7 m/s at the end of 6.1 s. At that time, the
kinetic energy of the system is 85 J and each
mass has moved a distance of 20.435 m

Find the value of heavier mass. The acceleration due to gravity is 9.81 m/s
2
.
Answer in units of k